1. TOPIC: Ecology AIM: How are materials cycled through the environment?

2. Water
Cycle
Evaporation (L  G)
Condensation (G L)

3. Transpiration (liquid evap from leaves)
Precipitation (rain…)

6. Involves photosynthesis & respiration
Carbon &
Oxygen
Cycle
Involves photosynthesis & respiration
oxygen
Cellular Respiration
Photosynthesis
carbon dioxide

9. Nitrogen
Cycle
Transfer of N from air to soil, to living things & back to air

10. Nitrogen-fixing bacteria  convert nitrogen gas to nitrates

11. Plants use nitrates for protein synthesis

12. Animals eat plants (produce nitrogenous wastes = urea & ammonia)

13. Decomposers break down nitrogenous wastes and dead plants and animals  release ammonia into soil

14. Nitrifying bacteria convert ammonia into nitrates

15. Plants use the nitrates OR
Denitrifying bacteria converts nitrates to nitrogen gas